Photodehydrocyclizations of stilbene-like compounds VII: Synthesis and properties of the double helicene, diphenanthro[3,4-c ;3′,4′-l ]chrysene

PHOTODEHYDROCY CLIZATIONS OF STILBENE-LIKE COMPOUNDS VII1 Synthesis and properties of the double helicene, diphenanthro[3,4-c; 3',4'-/]chrysene

PHOTODEHYDROCY CLIZATIONS OF STILBENE-LIKE COMPOUNDS VII1 Synthesis and properties of the double helicene, diphenanthro[3,4-c; 3',4'-/]chrysene BY

PHOTODEHYDROCYCLIZATIONS OF STILBENE-LIKE COMPOUNDS VIII1 Synthesis of hexaheliceno[3,4-c]hexahelicene BY

PHOTODEHYDROCYCLIZATIONS OF STILBENE-LIKE COMPOUNDS VIII1 Synthesis of hexaheliceno[3,4-c]hexahelicene

comparison of catalytic activity of heteropoly compounds in the synthesis of bis(indolyl)alkanes.

heteropoly acids (hpa) and their salts have advantages as catalysts which make them both economically and environmentally attractive, strong br?nsted acidity, exhibiting fast reversible multi-electron redox transformations under rather mild conditions, very high solubility in polar solvents, fairly high thermal stability in the solid states, and efficient oxidizing ability, so that they are imp...